Test: Genetics

Consider an alien species that has two major physical traits that follow the principles of Mendelian genetics: horn arrangement and horn color. For this species, forehead horns can either be arranged in a trio of small horns or as a single large horn. Horn color can be either black or white.

The trio arrangement is a dominant trait, and alleles for horn arrangement use the letter "T." The white coloration is also a dominant trait, and alleles for horn color use the letter "W."

1.

Which of the following would produce the highest proportion of offspring having three black horns when crossed with an alien heterozygous for both traits?

TTww

ttWW

TtWw

ttWw

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